Rebooted the server and tried again in IE. Looking at server processes. Currently, about 10% CPU usage and 7% memory usage on the whole server. Why it's timing out, I have no idea. I can't upload an addon. There's no error logs--not in the ACP, not in the server error logs, nowhere. This makes no sense and is incredibly frustrating.

Every time I re-try the install, users stop being able to post/create threads, even after timeout. Have to reboot all over again. I'm lost.